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                    1.3Dos命令
            
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                    1.3.1常用DOS命令(command)
            
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                    3_ 计算机语言的发展迭代史
            
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                    4_ Java语言版本迭代概述
            
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                    5_ Java语言应用的领域
            
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                    1.主要特性
            
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                    7_ Java两种核心机制
            
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                    二、开发环境的搭建（重点）
            
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                    2_ JDK的下载、安装
            
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                    1、为什么配置path环境变量？
            
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                    三、第一个Java程序
            
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                    1、开发体验—HelloWorld
            
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                    1.1编写
            
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                    1.注释：Comment
            
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                    DAY02 数据类型到进制
            
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                    基本数据类型
            
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                    引用类型和基本类型的区别
            
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                    浮点数为什么不精准整数是不是精准的为什么
            
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                    强类型的好处是什么
            
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                    简要描述java中的8种数据类型
            
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                    变量的使用与类型兼容性
            
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                    变量使用时有哪些注意事项
            
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                    变量赋值的兼容机制
            
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                    什么是变量什么是常量什么是字面量
            
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                    数值字面值的默认类型是什么
            
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                    编译器对变量和常量如何区别处理
            
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                    为什么浮点数没有变量常量区别处理
            
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                    数值范围从小到大的排序是什么
            
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                    自动类型提升的主要规则(数值型)
            
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                    强制类型转换
            
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                    字符与字符串
            
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                <a href="DAY02 回忆式笔记.html#字符型存储的究竟是什么">
            
                    
                    字符型存储的究竟是什么
            
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                <a href="DAY02 回忆式笔记.html#字符串引用类型">
            
                    
                    字符串(引用类型)
            
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        <li class="chapter " data-level="1.3.3.3" data-path="DAY02 回忆式笔记.html">
            
                <a href="DAY02 回忆式笔记.html#字符串转换">
            
                    
                    字符串转换
            
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        <li class="chapter " data-level="1.3.4" data-path="DAY02 回忆式笔记.html">
            
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                    进制
            
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                <a href="DAY02 回忆式笔记.html#权值是什么各进制如何表示">
            
                    
                    权值是什么各进制如何表示
            
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                <a href="DAY02 回忆式笔记.html#研究16进制的意义是什么">
            
                    
                    研究16进制的意义是什么
            
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                <a href="DAY02 回忆式笔记.html#8421法实现16进制与2进制互转">
            
                    
                    8421法实现16进制与2进制互转
            
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                    什么是补码(了解)
            
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                <a href="DAY02 回忆式笔记.html#补码和-1分别解决了什么问题">
            
                    
                    补码和-1分别解决了什么问题
            
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                    作业3 求1000以内质数的平均值
            
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<p>&#x7B2C;&#x4E09;&#x90E8;&#x5206;&#xFF1A;&#x5F00;&#x53D1;Java SE&#x9AD8;&#x7EA7;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;</p>
<p>&#x4E3B;&#x8981;&#x77E5;&#x8BC6;&#x70B9;&#xFF1A;&#x5F02;&#x5E38;&#x3001;&#x96C6;&#x5408;&#x3001;I/O&#x3001;&#x591A;&#x7EBF;&#x7A0B;&#x3001;&#x53CD;&#x5C04;&#x673A;&#x5236;&#x3001;&#x7F51;&#x7EDC;&#x7F16;&#x7A0B;&#x3001;...</p>
<p>&#x7B2C;&#x56DB;&#x90E8;&#x5206;&#xFF1A;&#x5B9E;&#x8BAD;&#x9879;&#x76EE;</p>
<blockquote>
<p>&#x9879;&#x76EE;&#x4E00;&#xFF1A;&#x5BB6;&#x5EAD;&#x6536;&#x652F;&#x8BB0;&#x8D26;&#x8F6F;&#x4EF6;                &#x8BB2;&#x5B8C;&#x6D41;&#x7A0B;&#x63A7;&#x5236;&#x65F6;&#x53EF;&#x4EE5;&#x505A;&#x3002;&#x7B2C;&#x4E8C;&#x7AE0;&#x7ED3;&#x675F;
&#x9879;&#x76EE;&#x4E8C;&#xFF1A;&#x5BA2;&#x6237;&#x4FE1;&#x606F;&#x7BA1;&#x7406;&#x8F6F;&#x4EF6;                &#x8BB2;&#x5B8C;&#x7B2C;&#x56DB;&#x7AE0;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#xFF08;&#x4E0A;&#xFF09;&#x65F6;&#x53EF;&#x4EE5;&#x505A;
&#x9879;&#x76EE;&#x4E09;&#xFF1A;&#x5F00;&#x53D1;&#x56E2;&#x961F;&#x4EBA;&#x5458;&#x8C03;&#x5EA6;&#x8F6F;&#x4EF6;        &#x8BB2;&#x5B8C;&#x7B2C;&#x4E03;&#x7AE0;&#x5F02;&#x5E38;&#x5904;&#x7406;&#x540E;&#x53EF;&#x4EE5;&#x505A;
&#x9644;&#x52A0;&#x9879;&#x76EE;&#x4E00;&#xFF1A;&#x94F6;&#x884C;&#x4E1A;&#x52A1;&#x7BA1;&#x7406;&#x8F6F;&#x4EF6;        &#x8BB2;&#x5B8C;&#x7B2C;&#x4E03;&#x7AE0;&#x5F02;&#x5E38;&#x5904;&#x7406;&#x540E;&#x53EF;&#x4EE5;&#x505A;
&#x9644;&#x52A0;&#x9879;&#x76EE;&#x4E8C;&#xFF1A;&#x5355;&#x673A;&#x8003;&#x8BD5;&#x7BA1;&#x7406;&#x8F6F;&#x4EF6;        &#x8BB2;&#x5B8C;&#x7B2C;&#x5341;&#x4E00;&#x7AE0;IO&#x6D41;&#x4EE5;&#x540E;&#x53EF;&#x4EE5;&#x505A;</p>
</blockquote>
<h3 id="2-java&#x8BED;&#x8A00;&#x6982;&#x8FF0;">2_ Java&#x8BED;&#x8A00;&#x6982;&#x8FF0;</h3>
<h4 id="1&#x3001;&#x57FA;&#x7840;&#x5E38;&#x8BC6;">1&#x3001;&#x57FA;&#x7840;&#x5E38;&#x8BC6;</h4>
<h5 id="11&#x786C;&#x4EF6;&#xFF08;hardware&#xFF09;">1.1&#x786C;&#x4EF6;&#xFF08;Hardware&#xFF09;</h5>
<p>&#x80FD;&#x770B;&#x5F97;&#x89C1;&#x6478;&#x5F97;&#x7740;&#x7684;&#x7535;&#x5B50;&#x5668;&#x4EF6;</p>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210820092410001.png" alt=""></p>
<h5 id="12&#x8F6F;&#x4EF6;&#xFF08;software&#xFF09;">1.2&#x8F6F;&#x4EF6;&#xFF08;SoftWare&#xFF09;</h5>
<p>&#x5373;&#x4E00;&#x7CFB;&#x5217;&#x6309;&#x7167;&#x7279;&#x5B9A;&#x987A;&#x5E8F;&#x7EC4;&#x7EC7;&#x7684;&#x8BA1;&#x7B97;&#x673A;&#x6570;&#x636E;&#x548C;&#x6307;&#x4EE4;&#x7684;&#x96C6;&#x5408;&#x3002;&#x5206;&#x4E3A;  &#x7CFB;&#x7EDF;&#x8F6F;&#x4EF6;  &#x548C;  &#x5E94;&#x7528;&#x8F6F;&#x4EF6;</p>
<h6 id="121&#x7CFB;&#x7EDF;&#x8F6F;&#x4EF6;&#xFF08;operation-system&#xFF09;">1.2.1&#x7CFB;&#x7EDF;&#x8F6F;&#x4EF6;&#xFF08;Operation System&#xFF09;</h6>
<p>&#x7BA1;&#x7406;&#x786C;&#x4EF6;&#x548C;&#x8F6F;&#x4EF6;&#xFF0C;&#x4F7F;&#x5F97;&#x7528;&#x6237;&#x975E;&#x5E38;&#x65B9;&#x4FBF;&#x7684;&#x4F7F;&#x7528;&#x5230;&#x786C;&#x4EF6;&#x548C;&#x8F6F;&#x4EF6;</p>
<p>&#x4EBA;&#x673A;&#x4EA4;&#x4E92;&#xFF1A;&#x901A;&#x8FC7;OS&#x6765;&#x4F7F;&#x7528;&#x786C;&#x4EF6;&#x548C;&#x8F6F;&#x4EF6;</p>
<p>1) &#x56FE;&#x5F62;&#x5316;&#x754C;&#x9762; &#xFF1A;&#x7B80;&#x5355;&#xFF0C;&#x6613;&#x4E0A;&#x624B;
2) &#x547D;&#x4EE4;&#x884C;&#x65B9;&#x5F0F; &#xFF1A;&#x590D;&#x6742;&#xFF0C;&#x4E0D;&#x6613;&#x4E0A;&#x624B;&#xFF0C;&#x9700;&#x8981;&#x8BB0;&#x4F4F;&#x547D;&#x4EE4;</p>
<h6 id="122&#x5E94;&#x7528;&#x8F6F;&#x4EF6;">1.2.2&#x5E94;&#x7528;&#x8F6F;&#x4EF6;</h6>
<p>&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x67D0;&#x4E2A;&#x95EE;&#x9898;&#x800C;&#x5F00;&#x53D1;&#x7684;&#x8F6F;&#x4EF6;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              </p>
<p><span style="background:yellow">&#x5E94;&#x7528;&#x7A0B;&#x5E8F; = &#x7B97;&#x6CD5; + &#x6570;&#x636E;&#x7ED3;&#x6784;</span></p>
<h5 id="13dos&#x547D;&#x4EE4;">1.3Dos&#x547D;&#x4EE4;</h5>
<p>&#x542F;&#x52A8;&#x547D;&#x4EE4;&#x884C;&#x63A7;&#x5236;&#x53F0;&#xFF0C; win+r  =&gt; cmd =&gt; &#x56DE;&#x8F66;</p>
<h6 id="131&#x5E38;&#x7528;dos&#x547D;&#x4EE4;command">1.3.1&#x5E38;&#x7528;DOS&#x547D;&#x4EE4;(command)</h6>
<blockquote>
<p>&#x200B;    dir&#xFF1A;&#x5217;&#x51FA;&#x5F53;&#x524D;&#x76EE;&#x5F55;&#x4E0B;&#x7684;&#x6587;&#x4EF6;&#x4EE5;&#x53CA;&#x6587;&#x4EF6;&#x5939;
&#x200B;    md&#xFF1A;&#x521B;&#x5EFA;&#x76EE;&#x5F55;
&#x200B;    rd&#xFF1A;&#x5220;&#x9664;&#x76EE;&#x5F55;
&#x200B;    cd&#xFF1A;&#x8FDB;&#x5165;&#x6307;&#x5B9A;&#x76EE;&#x5F55;
&#x200B;    cd..&#xFF1A;&#x9000;&#x56DE;&#x5230;&#x4E0A;&#x4E00;&#x7EA7;&#x76EE;&#x5F55;
&#x200B;    cd/&#xFF1A;&#x9000;&#x56DE;&#x5230;&#x6839;&#x76EE;&#x5F55;
&#x200B;    del&#xFF1A;&#x5220;&#x9664;&#x6587;&#x4EF6;
&#x200B;    exit&#xFF1A;&#x63A8;&#x51FA;dos&#x547D;&#x4EE4;&#x884C;</p>
</blockquote>
<h6 id="132&#x547D;&#x4EE4;&#x7684;&#x5206;&#x7C7B;">1.3.2&#x547D;&#x4EE4;&#x7684;&#x5206;&#x7C7B;</h6>
<p>1) &#x5185;&#x90E8;&#x547D;&#x4EE4;&#xFF1A;OS&#x5185;&#x7F6E;&#x7684;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x8FD0;&#x884C;</p>
<p>2) &#x5916;&#x90E8;&#x547D;&#x4EE4;&#xFF1A;</p>
<p>   1&#xFF09;&#x4FDD;&#x5B58;&#x5728;&#x786C;&#x76D8;&#x4E0A;&#x7684;&#x4E00;&#x4E2A;&#x53EF;&#x4EE5;&#x6267;&#x884C;&#x7684;&#x6587;&#x4EF6;  .exe </p>
<p>   2&#xFF09;&#x5916;&#x90E8;&#x547D;&#x4EE4;&#x5728;&#x6267;&#x884C;&#x65F6;&#xFF0C;&#x9700;&#x8981;&#x8BA9;OS&#x627E;&#x5230;&#xFF08;&#x8DEF;&#x5F84;&#xFF09;</p>
<p>   3&#xFF09;&#x4F9D;&#x8D56;&#x4E00;&#x4E2A;Path&#x73AF;&#x5883;&#x53D8;&#x91CF;</p>
<h3 id="3-&#x8BA1;&#x7B97;&#x673A;&#x8BED;&#x8A00;&#x7684;&#x53D1;&#x5C55;&#x8FED;&#x4EE3;&#x53F2;">3_ &#x8BA1;&#x7B97;&#x673A;&#x8BED;&#x8A00;&#x7684;&#x53D1;&#x5C55;&#x8FED;&#x4EE3;&#x53F2;</h3>
<p>&#x7B2C;&#x4E00;&#x4EE3;&#xFF1A;&#x673A;&#x5668;&#x8BED;&#x8A00;</p>
<p>&#x7B2C;&#x4E8C;&#x4EE3;&#xFF1A;&#x6C47;&#x7F16;&#x8BED;&#x8A00;</p>
<p>&#x7B2C;&#x4E09;&#x4EE3;&#xFF1A;&#x9AD8;&#x7EA7;&#x8BED;&#x8A00;
        &#x9762;&#x5411;&#x8FC7;&#x7A0B;&#xFF1A;C&#x3001;Pascal&#x3001;Fortran
        &#x9762;&#x5411;&#x5BF9;&#x8C61;&#xFF1A;Java&#x3001;js&#x3001;python&#x3001;Scala&#xFF0C;....</p>
<h3 id="4-java&#x8BED;&#x8A00;&#x7248;&#x672C;&#x8FED;&#x4EE3;&#x6982;&#x8FF0;">4_ Java&#x8BED;&#x8A00;&#x7248;&#x672C;&#x8FED;&#x4EE3;&#x6982;&#x8FF0;</h3>
<p>1996&#x5E74;&#xFF0C;&#x53D1;&#x5E03;JDK1.0&#xFF0C;Java&#x9762;&#x4E16;
2004&#x5E74;&#xFF0C;&#x53D1;&#x5E03;&#x91CC;&#x7A0B;&#x7891;&#x5F0F;&#x7248;&#x672C;&#xFF1A;JDK1.5&#xFF0C;&#x4E3A;&#x7A81;&#x51FA;&#x6B64;&#x7248;&#x672C;&#x7684;&#x91CD;&#x8981;&#x6027;&#xFF0C;&#x66F4;&#x540D;&#x4E3A;JDK5.0
2005&#x5E74;&#xFF0C;J2SE-&gt;JavaSE&#xFF0C;J2EE-&gt;JavaEE&#xFF0C;J2ME-&gt;JavaME
2014&#x5E74;&#xFF0C;&#x53D1;&#x5E03;JDK8.0&#xFF0C;&#x662F;&#x7EE7;JDK5.0&#x4EE5;&#x6765;&#x53D8;&#x5316;&#x6700;&#x5927;&#x7684;&#x7248;&#x672C;</p>
<h3 id="5-java&#x8BED;&#x8A00;&#x5E94;&#x7528;&#x7684;&#x9886;&#x57DF;">5_ Java&#x8BED;&#x8A00;&#x5E94;&#x7528;&#x7684;&#x9886;&#x57DF;</h3>
<p>Java Web&#x5F00;&#x53D1;&#xFF1A;&#x540E;&#x53F0;&#x5F00;&#x53D1;
&#x5927;&#x6570;&#x636E;&#x5F00;&#x53D1;
Android&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x5F00;&#x53D1;&#xFF1A;&#x5BA2;&#x6237;&#x7AEF;&#x5F00;&#x53D1;</p>
<h3 id="6-java&#x8BED;&#x8A00;&#x7684;&#x7279;&#x70B9;">6_ Java&#x8BED;&#x8A00;&#x7684;&#x7279;&#x70B9;</h3>
<h4 id="1&#x4E3B;&#x8981;&#x7279;&#x6027;">1.&#x4E3B;&#x8981;&#x7279;&#x6027;</h4>
<p>1.&#x7B80;&#x5355;&#x6027;&#xFF1A;&#x76F8;&#x6BD4;&#x4E8E;c/C++&#x7B80;&#x5355;&#x6613;&#x5B66;</p>
<p>2.&#x5B89;&#x5168;&#x6027;&#xFF1A;&#x6BCF;&#x4E00;&#x6B21;class&#x7684;&#x52A0;&#x8F7D;&#x90FD;&#x4F1A;&#x901A;&#x8FC7;classloader&#x6765;&#x8FDB;&#x884C;&#x68C0;&#x9A8C;</p>
<p>3.&#x8DE8;&#x5E73;&#x53F0;&#xFF1A;&#x901A;&#x8FC7;jvm&#x865A;&#x62DF;&#x673A; &#x5B9E;&#x73B0;&#x4E00;&#x5957;&#x4EE3;&#x7801;&#x591A;&#x7AEF;&#x6267;&#x884C;&#x53EA;&#x9700;&#x5F80;&#x5BF9;&#x5E94;&#x7684;OS&#x4E2D;&#x5B89;&#x88C5;&#x5BF9;&#x5E94;&#x7684;JVM</p>
<p>4.&#x6027;&#x80FD;&#x597D;&#xFF1A; java&#x662F;&#x7F16;&#x8BD1;&#x6027;&#x8BED;&#x8A00;&#x6BD4;&#x89E3;&#x91CA;&#x578B;&#x5FEB;</p>
<p>5.&#x591A;&#x7EBF;&#x7A0B;&#xFF1A; &#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x591A;&#x4E2A;&#x7EBF;&#x7A0B;&#x5E76;&#x884C;&#x6267;&#x884C;&#x5B8C;&#x7F8E;&#x7684;&#x5229;&#x7528;cpu</p>
<p>6.&#x5206;&#x5E03;&#x5F0F;&#xFF1A; &#x57FA;&#x4E8E;&#x7F51;&#x7EDC;&#x591A;&#x7AEF;&#x8FD0;&#x884C;&#x3001;</p>
<p>7.&#x9762;&#x5411;&#x5BF9;&#x8C61;&#xFF1A; </p>
<p>&#x200B;            &#x9762;&#x5411;&#x8FC7;&#x7A0B;&#xFF1A;&#x5173;&#x6CE8;&#x7684;&#x662F;&#x5B8C;&#x6210;&#x4E00;&#x4EF6;&#x4E8B;&#x9700;&#x8981;&#x7684;&#x6B65;&#x9AA4;</p>
<p>&#x200B;            &#x9762;&#x5411;&#x5BF9;&#x8C61;&#xFF1A; &#x5173;&#x6CE8;&#x7684;&#x662F;&#x8C01;&#x80FD;&#x5B8C;&#x6210;&#x8FD9;&#x4EF6;&#x4E8B;&#x6211;&#x6307;&#x6D3E;&#x8C01;</p>
<p>8.&#x5065;&#x58EE;&#x6027;&#xFF1A;&#x5F3A;&#x7C7B;&#x578B; &#x4E0D;&#x6613;&#x51FA;&#x9519;</p>
<p>&#x200B;            &#x5783;&#x573E;&#x56DE;&#x6536;&#x673A;&#x5236; &#x51CF;&#x5C11;&#x5F00;&#x53D1;&#x8005;&#x81EA;&#x5DF1;&#x5904;&#x7406;&#x5783;&#x573E;&#x56DE;&#x6536;&#x95EE;&#x9898; --&gt;&#x4ECD;&#x7136;&#x4F1A;&#x51FA;&#x73B0;&#x5185;&#x5B58;&#x6EA2;&#x51FA;&#x3001;&#x5185;&#x5B58;&#x6CC4;&#x6F0F;</p>
<p>&#x200B;            &#x5B8C;&#x5584;&#x7684;&#x5F02;&#x5E38;&#x673A;&#x5236;, &#x6307;&#x9488;&#x7684;&#x5B89;&#x5168;&#x5316;=&gt;&#x5F15;&#x7528;</p>
<h4 id="2&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x6027;">2.&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x6027;</h4>
<p>&#x200B;        &#x4E24;&#x4E2A;&#x8981;&#x7D20;&#xFF1A;&#x7C7B;&#x3001;&#x5BF9;&#x8C61;
&#x200B;        &#x4E09;&#x4E2A;&#x7279;&#x5F81;&#xFF1A;&#x5C01;&#x88C5;&#x3001;&#x7EE7;&#x627F;&#x3001;&#x591A;&#x6001;</p>
<h3 id="7-java&#x4E24;&#x79CD;&#x6838;&#x5FC3;&#x673A;&#x5236;">7_ Java&#x4E24;&#x79CD;&#x6838;&#x5FC3;&#x673A;&#x5236;</h3>
<blockquote>
<p>1) Java&#x865A;&#x62DF;&#x673A;&#xFF08;Java Virtal Machine&#xFF09;
2) &#x5783;&#x573E;&#x6536;&#x96C6;&#x673A;&#x5236;&#xFF08;Garbage Collection&#xFF09;</p>
</blockquote>
<h2 id="&#x4E8C;&#x3001;&#x5F00;&#x53D1;&#x73AF;&#x5883;&#x7684;&#x642D;&#x5EFA;&#xFF08;&#x91CD;&#x70B9;&#xFF09;">&#x4E8C;&#x3001;&#x5F00;&#x53D1;&#x73AF;&#x5883;&#x7684;&#x642D;&#x5EFA;&#xFF08;&#x91CD;&#x70B9;&#xFF09;</h2>
<h3 id="1-jdk&#x3001;jre&#x3001;jvm&#x7684;&#x5173;&#x7CFB;">1_ JDK&#x3001;JRE&#x3001;JVM&#x7684;&#x5173;&#x7CFB;</h3>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819193931665.png" alt="image-20210819193931665"></p>
<h3 id="2-jdk&#x7684;&#x4E0B;&#x8F7D;&#x3001;&#x5B89;&#x88C5;">2_ JDK&#x7684;&#x4E0B;&#x8F7D;&#x3001;&#x5B89;&#x88C5;</h3>
<blockquote>
<p>&#x4E0B;&#x8F7D;&#xFF1A;&#x5B98;&#x7F51;&#xFF0C;GitHub</p>
<p>&#x5B89;&#x88C5;&#xFF1A;&#x50BB;&#x74DC;&#x5F0F;&#x5B89;&#x88C5;
        <span style="color:red">&#x6CE8;&#x610F;&#x95EE;&#x9898;&#xFF1A;&#x5B89;&#x88C5;&#x8F6F;&#x4EF6;&#x7684;&#x8DEF;&#x5F84;&#x4E2D;&#x4E0D;&#x80FD;&#x5305;&#x542B;&#x4E2D;&#x6587;&#x3001;&#x7A7A;&#x683C;&#x3002;</span></p>
</blockquote>
<h3 id="3-path&#x73AF;&#x5883;&#x53D8;&#x91CF;&#x7684;&#x914D;&#x7F6E;">3_ path&#x73AF;&#x5883;&#x53D8;&#x91CF;&#x7684;&#x914D;&#x7F6E;</h3>
<h4 id="1&#x3001;&#x4E3A;&#x4EC0;&#x4E48;&#x914D;&#x7F6E;path&#x73AF;&#x5883;&#x53D8;&#x91CF;&#xFF1F;">1&#x3001;&#x4E3A;&#x4EC0;&#x4E48;&#x914D;&#x7F6E;path&#x73AF;&#x5883;&#x53D8;&#x91CF;&#xFF1F;</h4>
<blockquote>
<p>path&#x73AF;&#x5883;&#x53D8;&#x91CF;&#xFF1A;windows&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x6267;&#x884C;&#x547D;&#x4EE4;&#x65F6;&#x6240;&#x8981;&#x641C;&#x5BFB;&#x7684;&#x8DEF;&#x5F84;
&#x4E3A;&#x4EC0;&#x4E48;&#x8981;&#x914D;&#x7F6E;&#xFF1A;&#x5E0C;&#x671B;Java&#x7684;&#x5F00;&#x53D1;&#x5DE5;&#x5177;&#xFF08;javac.exe&#xFF0C;java.exe&#xFF09;&#x5728;&#x4EFB;&#x4F55;&#x7684;&#x6587;&#x4EF6;&#x8DEF;&#x5F84;&#x4E0B;&#x90FD;&#x53EF;&#x4EE5;&#x6267;&#x884C;&#x6210;&#x529F;&#x3002;</p>
</blockquote>
<h4 id="12&#x3001;&#x5982;&#x4F55;&#x914D;&#x7F6E;&#xFF1F;">1.2&#x3001;&#x5982;&#x4F55;&#x914D;&#x7F6E;&#xFF1F;</h4>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819195222567.png" alt="image-20210819195222567"></p>
<h2 id="&#x4E09;&#x3001;&#x7B2C;&#x4E00;&#x4E2A;java&#x7A0B;&#x5E8F;">&#x4E09;&#x3001;&#x7B2C;&#x4E00;&#x4E2A;Java&#x7A0B;&#x5E8F;</h2>
<h3 id="1&#x3001;&#x5F00;&#x53D1;&#x4F53;&#x9A8C;&#x2014;helloworld">1&#x3001;&#x5F00;&#x53D1;&#x4F53;&#x9A8C;&#x2014;HelloWorld</h3>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819200226043.png" alt="image-20210819200226043"></p>
<h4 id="11&#x7F16;&#x5199;">1.1&#x7F16;&#x5199;</h4>
<blockquote>
<p>&#x521B;&#x5EFA;&#x4E00;&#x4E2A;java&#x6E90;&#x6587;&#x4EF6;&#xFF1A;HelloWorld.java</p>
<pre><code class="lang-java"><span class="hljs-comment">/*
    public &#x662F;&#x516C;&#x5171;&#x7684;
    class &#x662F;&#x7C7B;&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x662F;&#x7C7B;&#x7684;&#x5B9A;&#x4E49;&#x3002;&#x7C7B;&#x662F;Java&#x7A0B;&#x5E8F;&#x7684;&#x57FA;&#x672C;&#x5355;&#x4F4D;&#xFF0C;&#x6240;&#x6709;&#x7684;Java&#x7A0B;&#x5E8F;&#x90FD;&#x5FC5;&#x987B;&#x81F3;&#x5C11;&#x4E00;&#x4E2A;&#x7C7B;
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">HelloChina</span></span>{
    <span class="hljs-comment">// &#x65B9;&#x6CD5; &#xFF1A;Java&#x7A0B;&#x5E8F;&#x7684;&#x4E00;&#x4E2A;&#x72EC;&#x7ACB;&#x7684;&#x529F;&#x80FD;&#x5355;&#x4F4D;&#x3002;&#x65B9;&#x6CD5;&#x4E0D;&#x53EF;&#x4EE5;&#x5D4C;&#x5957;&#xFF0C;&#x65B9;&#x6CD5;&#x96B6;&#x5C5E;&#x4E8E;&#x7C7B;</span>
 <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> viod <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span></span>{
     System.out.println(<span class="hljs-string">&quot;Hello,World!&quot;</span>);
 }
}
</code></pre>
</blockquote>
<h4 id="12&#x7F16;&#x8BD1;">1.2&#x7F16;&#x8BD1;</h4>
<blockquote>
<p>javac HelloWorld.java</p>
</blockquote>
<h4 id="13&#x8FD0;&#x884C;">1.3&#x8FD0;&#x884C;</h4>
<blockquote>
<p>java HelloChina</p>
</blockquote>
<h3 id="2&#x5E38;&#x89C1;&#x95EE;&#x9898;&#x7684;&#x89E3;&#x51B3;">2.&#x5E38;&#x89C1;&#x95EE;&#x9898;&#x7684;&#x89E3;&#x51B3;</h3>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819201105924.png" alt="image-20210819201105924"></p>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819201141016.png" alt="image-20210819201141016"></p>
<h3 id="3&#x603B;&#x7ED3;&#x7B2C;&#x4E00;&#x4E2A;&#x7A0B;&#x5E8F;">3.&#x603B;&#x7ED3;&#x7B2C;&#x4E00;&#x4E2A;&#x7A0B;&#x5E8F;</h3>
<h2 id="&#x56DB;&#x3001;&#x6CE8;&#x91CA;&#x4E0E;api&#x6587;&#x6863;">&#x56DB;&#x3001;&#x6CE8;&#x91CA;&#x4E0E;API&#x6587;&#x6863;</h2>
<h3 id="1&#x6CE8;&#x91CA;&#xFF1A;comment">1.&#x6CE8;&#x91CA;&#xFF1A;Comment</h3>
<p>&#x5206;&#x7C7B;&#xFF1A;
        &#x5355;&#x884C;&#x6CE8;&#x91CA;&#xFF1A; //
        &#x591A;&#x884C;&#x6CE8;&#x91CA;&#xFF1A;/<em>        </em>/
        &#x6587;&#x6863;&#x6CE8;&#x91CA;&#xFF1A;/<em>*        </em>/</p>
<p>&#x4F5C;&#x7528;&#xFF1A;
        &#x2460;&#x5BF9;&#x6240;&#x5199;&#x7684;&#x7A0B;&#x5E8F;&#x8FDB;&#x884C;&#x89E3;&#x91CA;&#x8BF4;&#x660E;&#xFF0C;&#x589E;&#x5F3A;&#x53EF;&#x8BFB;&#x6027;&#x3002;&#x65B9;&#x4FBF;&#x81EA;&#x5DF1;&#xFF0C;&#x65B9;&#x4FBF;&#x522B;&#x4EBA;
        &#x2461;&#x8C03;&#x8BD5;&#x6240;&#x5199;&#x7684;&#x4EE3;&#x7801;</p>
<p>&#x7279;&#x70B9;&#xFF1A;
        &#x2460;&#x5355;&#x884C;&#x6CE8;&#x91CA;&#x548C;&#x591A;&#x884C;&#x6CE8;&#x91CA;&#x7684;&#x5185;&#x5BB9;&#x4E0D;&#x53C2;&#x4E0E;&#x7F16;&#x8BD1;&#x3002;&#xFF08;&#x7F16;&#x8BD1;&#x4EE5;&#x540E;&#x751F;&#x6210;&#x7684;.class&#x7ED3;&#x5C3E;&#x7684;&#x5B57;&#x8282;&#x7801;&#x6587;&#x4EF6;&#x4E2D;&#x4E0D;&#x5305;&#x542B;&#x6CE8;&#x91CA;&#x6389;&#x7684;&#x4FE1;&#x606F;&#xFF09;
        &#x2461;&#x6CE8;&#x91CA;&#x5185;&#x5BB9;&#x53EF;&#x4EE5;&#x88AB;JDK&#x63D0;&#x4F9B;&#x7684;&#x5DE5;&#x5177; javadoc &#x6240;&#x89E3;&#x6790;&#xFF0C;&#x751F;&#x6210;&#x4E00;&#x5957;&#x4EE5;&#x7F51;&#x9875;&#x6587;&#x4EF6;&#x5F62;&#x5F0F;&#x4F53;&#x73B0;&#x7684;&#x8BE5;&#x7A0B;&#x5E8F;&#x7684;&#x8BF4;&#x660E;&#x6587;&#x6863;&#x3002;
        &#x2462;&#x591A;&#x884C;&#x6CE8;&#x91CA;&#x4E0D;&#x53EF;&#x4EE5;&#x5D4C;&#x5957;&#x4F7F;&#x7528;</p>
<h3 id="2java-api-&#x6587;&#x6863;">2.Java API &#x6587;&#x6863;</h3>
<blockquote>
<p>API&#xFF1A;&#x5C06;&#x8BED;&#x8A00;&#x63D0;&#x4F9B;&#x7684;&#x7C7B;&#x5E93;&#xFF0C;&#x90FD;&#x79F0;&#x4E3A;api&#x3002;</p>
<p>API&#x6587;&#x6863;&#xFF1A;&#x9488;&#x5BF9;&#x4E8E;&#x63D0;&#x4F9B;&#x7684;&#x7C7B;&#x5E93;&#x5982;&#x4F55;&#x4F7F;&#x7528;&#xFF0C;&#x7ED9;&#x7684;&#x4E00;&#x4E2A;&#x8BF4;&#x660E;&#x4E66;&#x3002;&#x7C7B;&#x4F3C;&#x4E8E;&#x300A;&#x65B0;&#x534E;&#x5B57;&#x5178;&#x300B;</p>
</blockquote>
<h3 id="3&#x826F;&#x597D;&#x7684;&#x7F16;&#x7A0B;&#x98CE;&#x683C;">3.&#x826F;&#x597D;&#x7684;&#x7F16;&#x7A0B;&#x98CE;&#x683C;</h3>
<p><img src="JavaSE&#x7B14;&#x8BB0;.assets/image-20210819202926471.png" alt="image-20210819202926471"></p>

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